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Alexey Romanenko commented on LIVY-535: --------------------------------------- https://github.com/apache/incubator-livy/pull/129 > Config option “livy.server.session.max-creation” doesn't work properly > ---------------------------------------------------------------------- > > Key: LIVY-535 > URL: https://issues.apache.org/jira/browse/LIVY-535 > Project: Livy > Issue Type: Bug > Affects Versions: 0.5.0 > Reporter: Alexey Romanenko > Assignee: Alexey Romanenko > Priority: Major > > Config option {{livy.server.session.max-creation}} doesn't work properly. > For example, I set the value of this option to “1” and try to submit 5 batch > jobs (example SparkPi) to Livy almost in the same time using a bash command > like this: > {code:bash} > for i in {1..5}; do curl -X POST --data '{"file": > "/tmp/spark-examples-2.jar", "className": > "org.apache.spark.examples.SparkPi"}' -H "Content-Type: application/json" > http://localhost:8999/batches; done > {code} > In such case, I expect that the only one job (first) will be submitted > properly and others will be rejected with a response message “Rejected, too > many sessions are being created!”. This is what I actually have when I submit > them manually, one by one. Though, in the case given above, almost always all > 5 jobs will be submitted properly (sometimes only one will be rejected) > despite of the value of config option. > Looks like, that code, where Livy checks the number of already created > sessions and launch new one, is not atomic: > https://github.com/apache/incubator-livy/blob/4cfb6bcb8fb9ac6b2d6c8b3d04b20f647b507e1f/server/src/main/scala/org/apache/livy/server/SessionServlet.scala#L130 > Also, the calculation of the total number of child processes in > {{tooManySessions()}} is not atomic operation too. > So, when I submit the jobs almost in the same moment (POST request takes only > about tens of milliseconds) then I can spawn more spark-submit processes > despite of maximum limitation. -- This message was sent by Atlassian JIRA (v7.6.3#76005)